**The belief in things about Mary, the pope, the priesthood, salvation, etc that are opposed to the bible. **
These are false assumptions. Please get the truth.
Where are you getting your information? From a pamphlet? From a preacher (non-Catholic) who hates Catholicism.
Source and specific references, please.
I do, from the bible. Searching the scriptures daily shows very clearly what is not true, who Mary is not, who the Pope is not and what has become of the priesthood.